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Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Contingent acquisition liability, total change $ (24.2)  
Long-term Debt, Fair Value $ 3,862.1 $ 3,995.0
Discount rate floor contingent acquisition obligations 1.00%  
Discount rate ceiling contingent acquisition obligations 4.00%  
Discount rate floor long-term debt 0.40%  
Discount rate ceiling long-term debt 3.40%  
Level 1    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Cash equivalents $ 1,504.4 1,507.4
Contingent acquisition obligations [1] 0.0 0.0
Long-term Debt, Fair Value 0.0 0.0
Level 2    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Cash equivalents 0.0 0.0
Contingent acquisition obligations [1] 0.0 0.0
Long-term Debt, Fair Value 3,819.0 3,951.1
Level 3    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Cash equivalents 0.0 0.0
Contingent acquisition obligations [1] 71.3 95.5
Long-term Debt, Fair Value 43.1 43.9
Fair Value, Total [Member]    
Fair value assets and liabilities measured on recurring and nonrecurring basis    
Cash equivalents 1,504.4 1,507.4
Contingent acquisition obligations [1] 71.3 95.5
Long-term Debt, Fair Value $ 3,862.1 $ 3,995.0
[1] Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $24.2 from December 31, 2020 to June 30, 2021 is primarily due to payments related to our deferred acquisitions payments from prior-year acquisitions partially offset by the exercises of redeemable noncontrolling interest and valuation adjustments in our consolidated subsidiaries. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.